Re: Criteria to join Indian Air Force having completed 12th standard in Vocational?

Definitely you can apply for the defence academy but only for the officers training academy and indian military academy after the completion of graduation through CDS examination.
Right now you are in final year so you have an option to apply for the university entry scheme as if you apply for the same then it will be easier to you go for the SSb round directly.
There will be no written examination after the same.
If you like to complete the engineering first then you get the option of CDS examination-
CDS stands for the combined defence services examination that is conducted two times a year.
You can get inti indian navy, air force and army through this examination, so if you like to apply for the indian millitary academy then age should be 19 to 24 years of age.
For officers training academy 19to 25 years of age.
for air force academy 19 to 23 years of age and for the naval academy 19 to 22 years of age is required.
You must be a graduate in any discipline from a recognised university to apply for indian army, if you have completed graduation with physics and maths then you can apply for indian air force and navy as well.
There will be following steps for the selection.
written examination.
SSB interview .
medical examination.
for more details log on to www.upsc.gov.in
thank you.